Related International Baccalaureate Chemistry essays

As shown on the graph, R2 (the correlation coefficient) equals to 0.5751, indicating that the data was not very reliable since the value was away from 1. In addition, the data points did not spread out, i.e., they were gathering at 0.004 to 0.006 moles. Consequently, the gradient was influenced.

Trial 1 information was not included in the lab due to large human error during the experiment. Table IX: Enthalpy of Formation of CaO Original Equation Enthalpy of Formation (kJ/mol) Ca(s) + 1/2O2(g) --> CaO(s) - 336.7 � 1.4 Trial 2 Table X: Enthalpies of Reaction After Manipulating The Given Equations for MgO Manipulated Equation Enthalpy of Reaction (kJ/mol)

it would not be possible to draw a good graph using points that are unevenly spaced apart Time interval is taken to be 5 seconds between each reading. Room temperature and pressure Conditions under which the experiments are performed should remain constant The experiments were carried out in the same room and on the same day.

This increase is attributed to the fact there is 1 more C-C bond and 2 more C-H bonds broken each time, which means the burning of the fuel is more exothermic so more heat will be given out to the surroundings and the enthalpy change will be greater.